Trimmer for sewing-machines.



PATENTED JUNE 18,1907.

Qm B N I H .0 HA M AG m N OW 0B h u D THE M M I R T T ',v v APPLIOA ION mum we 26 1901 2 SHEETSPSHEM L No. 857,491. PATENTED JUNE-118.1907.

J. 1). SGHO0NMAKER.- TRIMMER ronsawme MACHINES.

LI H 'IE APP UATIO FILED DEG 2B, 01 I 2 ET g.

for shifting th UNITED STATES PATENT orrr on. JOHN 'D. SOHOONMA-KER, OF "CAMDEN, NEW JERSEY. TRIMMER FOR SEWING-MACHINES.

Patented .Tune 18,.1907.

To all whom it may concern.- Be it known that I, JOHN DAVIS 'SOHOON- MAKER, a citizen of the United States, re-, siding at th e city of Camden, in the'county of Camden and State for Sewing-'Machines, is a specification.

Objects of the present invention are to provide an efiicient, reliable and durable trim-' mer which shall consist of comparatively few parts of simple construction, to provide e trimmer as of which .the following a whole to widen and narrow the seam, to hold the knives of the trimmer up to their work adjustably, yet positively and reliably, to provide for regulating the angle of the knives in respect to each other, and to provide for the convenient application of the trimmer to and its removal from the machine.

To these and other ends hereinafter set forth, the invention comprises the improvements to be presently described and finally claimed.

The nature, characteristic features and scope of my invention will be more fully understood from the following description taken in connection with the accompanying drawings forming part hereof and in which Figure 1, is a perspective view of a machine having a trimmer embodying features of the invention. Fig. 2, is a front view of the trimmer detached from the machine. Fig. 3, is an end view of the trimmer showing the knives, and Fig. 4, is a sectional view taken on the line 4-4, of Fig. 2.

In the drawings 1, indicates an overedge sewing machine having a driving shaft 2. The type of machine shown in the drawings is selected for purposes of illustration and it is fitted with appliances for making stitches over or around the edge of the fabric. The stitching mechanism includes a stitching needle and a lower hook or hooks (not shown) of well known construction and operation, for example of the type indicated in U. S. Patent #602,993, to Frank Malsch.

3, is a bracket which, in use, constitutes in effect a part of the table of the machine. This bracket 3,.is detachable from the machine and, as shown, it is provided on its base with ways 4, that slide on'the frame of the machine. There is an adjusting screw of New Jersey, have invented a certain newv nd useful Trimmer? 5, that co-operates with an open bearing 6, and serves to shift the bracket .crosswise of the line of sewing fora purpose which will .bepresently described.

7, is a clamp screw for holding thebracket 3,.to place on the machine.

8, is a rocker-shaftpivoted .to the :bracket 3, in such a way that it is aflorded slight endwise motion in its bearings. This shaft carries a knife holding arm 9, andalso an arm 10, which is connected by a link 11, with a cam on the main shaft 2. This cam serves to rock the shaft 8, and knife holding arm 9. The pin 12, which connects the arm 10, and link 11, is detachably screwed into the arm 10, so that it can be taken out to release the arm 10, when the trimmer is to be taken ofi. This pin 12, is also permitted to slide endvvise in the end of the link so as to permit the trimmer, as a whole, to be shifted transversely of the line of sewing. The arm 9, is fitted with a split clamping jaw that carries the knife 13. This knife 13, co-operates with the knife 14, which forms part of or is secured to the bracket 3. As shown this e 14, is mounted in a groove in the end of the bracket and is clamped or loosened by means of a pin or projection 15, carried at one end of a pivoted arm 16, of which the other end is provided with a clamping screw 17, so that when the latter is shifted, the pin is made to bind or free the knife 14.

18, is a set-screw whose point bears upon the end of the shaft 8. Thus b turning the set screw 18, it is possible to sh t the shaft 8,

endwise and thus cause the knives 13 and 14,

to bear upon each other, so that it is the set screw 18, which holds the knives up together laterally into. position for doing their work. i

19, is a finger or guide connected with the trimmer and over which the thread of the stitches is laid, so that when the bracket 3, is moved transversely of the line of feed, this guide 19, as well as the knives, is also moved and this seam is widened or narrowed.

By loosening the screw 20, it is possible to adjust the inclination of the arm 9, in respect to the arm 10, so as to change the inclination of the knife 13. The face 21, of the bracket 3, serves to deflect the trimmed material.

It will be obvious to those skilled in the art to which my invention ap ertains that modifications may be made in detail without departing from the spirit thereof, hence I do not limit myself to the precise construction and arrangement of parts hereinabove set forth and illustrated in the accompanying drawings, but

Having thus described the nature and objects of my invention, what I claim as new and desire to secure by Letters Patent is:

The combination of an overedge sewing machine, a detachable bracket having ways that slide on the frame of the machine, and provided at one end with an angular slot, an open bearing secured to the frame, an adjusting screw accommodated in said bearing for shifting the bracket longitudinally in respect to the frame, a rocker shaft journaled in the bracket with provision. for endwise adjustment, a knife slidably mounted in said slot,

a pivotal arm 16 for binding and releasing said knife, a clamping screw whereby said arm may be adjusted, a 00-0 erating adjustable vibrating knife carrie by the rocker shaft, a main driving shaft, and operative connections intermediate the latter and the rocker shaft such that the trimmer may be removed, said bracket having a guide 19, over which the thread is laid and having a part 21, to deflect the trimmed material, substantially as specified.

In testimony whereof I have hereunto signed my name.

JOHN D. SOHOONMAKER.

Witnesses W. J. JACKSON, FRANK T. KALAs. 

